A wrist for an articulated robot has an operative member which is rotatable about three mutually perpendicular axes and three motor units each of which can cause the operative member to rotate about only one of the three axes without causing any rotation about the other axes.
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1. A robot wrist including:
a support structure, a first drive unit connected rigidly to the support structure, a wrist portion driven by the first drive unit and supported by the support structure for rotation about a first axis, a further wrist portion supported by the driven wrist portion for rotation about a second axis perpendicular to the first axis, a second drive unit carried by the driven wrist portion for rotating the further wrist portion about the second axis, a third drive unit carried by the further wrist portion, and an operative terminal member driven by the third drive unit and rotatable on the further wrist portion about a third axis radial to the second axis; wherein the further wrist portion has a crank-like configuration with a proximal end which is rotated about the second axis by the second drive unit by means of a pair of bevel gears, and wherein the further wrist portion has a hollow structure and the third drive unit is connected rigidly to the further wrist portion with its axis coinciding with said second axis, the third drive unit being connected to the operative member by a belt transmission and a pair of bevel gears housed in the hollow structure of the further wrist portion.
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The present invention relates to an articulated industrial robot, that is, an industrial robot having at least one articulated arm with an articulated wrist at its distal end. The invention particularly concerns a wrist for a robot of this type.
Conventionally, the robot wrist carries an operative member, for example, a gripping member, which is rotatable about a plurality of axes. The wrist has a series of drive units for rotating the operative member about these axes. In conventional solutions, if the operative member is to be rotated about only one axis, more than one drive unit must always be operated, however, since it is necessary to operate both the drive unit controlling the preselected axis and at least one other drive unit in order to cancel out an undesired rotation about a further axis caused by the rotation about the preselected axis.
The object of the present invention is to eliminate this problem by the provision of a wrist in which it suffices to operate only one drive unit in order to rotate the operative member solely about the single, preselected axis.
In order to achieve this object, the subject of the invention is a robot wrist, characterised in that it includes:
a support structure,
a first drive unit connected rigidly to the support structure,
a member driven by the first drive unit and supported by the support structure for rotation about a first axis,
the driven member in turn supporting a further wrist portion for rotation about a second axis perpendicular to the first axis, the driven member in turn carrying a second drive unit for rotating the further wrist portion about the second axis, and the further wrist portion in turn carrying a third drive unit for driving an operative member of the robot which is rotatable on the further wrist portion about a third axis radial to the second axis.
The robot wrist according to the invention therefore has three motors which rotate the wrist respectively about three distinct, mutually perpendicular axes. The advantage of the device described above lies in the fact that the operation of only one motor rotates the wrist only about the axis controlled by that motor without causing undesired rotations about the other two axes which would have to be eliminated by the operation of the other motors.
Further characteristics and advantages of the invention will become clear from the description which follows with reference to the appended drawings, provided purely by way of non-limiting example, in which:
FIG. 1, is an exploded perspective view of a robot wrist according to the invention, and
FIG. 2 is a schematic view of the wrist of FIG. 1.
FIGS. 1 and 2 show a robot arm 13 whose structure includes a casing 20 in the form of a shell-like structure (of one or more rigidly-interconnected pieces) having an open end for enabling the insertion in the cavity 21 in the shell of a module 22 which includes a wrist 16 and the respective operating motors and which is partially assembled so that it can then be fitted in the shell 20 in a single operation. The particular structure of the robot arm described above, with a casing which performs a carrying function and a module which is housed in the casing in a disconnectible manner and includes the various motors and their transmissions, is the subject of a copendent patent application by the same Applicant.
The module 22 includes a cylindrical casing 23 with an electrical connector 24 at one end for quick connection to a complementary connector 25 which is disposed in the cavity 21 in the shell-like structure 20 and is connected to electrical wires 26 leading from electrical supply means. The connector 24 is connected by wires (not shown) to the various electric motors in the module 22. With reference also to FIG. 2, a first drive unit 27 is supported rigidly in the casing 23 of the module 22 and includes an electric motor 28 and an epicyclic reduction unit 29 which may be of any known type, for example, of the type marketed by the German company Harmonic Drive GmbH under the trademark "HARMONIC DRIVE". A member 30 which is driven by the drive unit 27 by means of a shaft 31 is also supported in the casing 23 for rotation about its axis 17. The casing 23 of the module 22 has an external annular flange 32 with axial holes 33 for the passage of screws 34 which engage threaded holes 35 in the annular end surface of the shell-like structure 20 so as to fix the module 22 to the shell-like structure. Naturally, any other type of fixing may be used. The cylindrical body of the driven member 30 has a portion 36 which projects from an open end 37 of the casing 23 and constitutes the load-bearing structure of the wrist 16. The portion 36 supports a further portion 38 of the wrist for rotation about the axis 18 which is perpendicular to the axis 17. The portion 38 is rotated about the axis 18 by a drive unit 39 fixed in the cylindrical body of the driven member 30 and including an electric motor 40 and a reduction unit 41 similar to the reduction unit 29. The output shaft of the motor unit 39 rotates the portion 38 of the wrist by means of a pair of bevel gears 42, 43 connected for rotation with the output shaft and with the portion 38 of the wrist, respectively. The portion 38 is constituted by a hollow structure with a crank-like configuration having a distal end part 44 which supports a terminal element 45 (for example, a gripping member) for rotation about the axis 19 which is radial to the axis 18 and intersects the latter at its intersection with the axis 17. The terminal element 45 is rotated about the axis 19 by a drive unit 46 which, in the embodiment illustrated, is within the body 36 and is fast for rotation with the portion 38 of the wrist. Still with reference to the embodiment illustrated, the drive unit 46 comprises an electric motor 47 and a reduction unit 48 which drives the rotatable terminal element 45 by means of a toothed-belt transmission 49 and a pair of bevel gears 50, 51, the transmission 49 and the bevel gears 50, 51 being within the hollow structure of the portion 38 of the wrist. As is clear from the foregoing description, in the robot wrist according to the invention, the drive units 27, 39 and 46 rotate the terminal element 45 of the wrist about the axes 17, 18 and 19 respectively as shown be the arrows A, B, and C respectively, in FIG. 2. The operation of a single drive unit rotates the wrist exclusively about the corresponding axis without causing the undesired rotations about the other two axes which take place in known robot wrists in which, in order to rotate the wrist about one axis, it is necessary to operate one electric motor to cause the rotation and at least one further motor to eliminate the resulting undesired rotation about another axis.
A further advantage of the wrist arrangement described above lies in the fact that it enables the module 22 to be fitted telescopically in the shell-like structure 20 with a drive unit for moving the module 22 between a position in which it is retracted fully within the shell-like structure 20 and an extended position. This further degree of freedom further increases the working capacity of the robot. The linear movement of the module 22 along the axis 17 may be achieved in any known manner, for example, by a screw driven by a motor in the shell-like structure 20 and engaging a female thread carried by the module 22.
Naturally, the principle of the invention remaining the same, the details of construction and forms of embodiment may be varied widely with respect to those described and illustrated purely by way of example. For example, the motor 47 for rotating the operative member 45 about the axis 19 may be mounted directly on the distal end of the wrist portion 38, thus avoiding the use of the belt transmission 49.
Zona, Mauro, Bettinardi, Marco
Patent | Priority | Assignee | Title |
10052155, | Jul 27 2000 | Intuitive Surgical Operations, Inc. | Roll-pitch-roll surgical tool |
10111711, | Jul 11 2011 | Board of Regents of the University of Nebraska | Robotic surgical devices, systems, and related methods |
10219870, | May 01 2012 | Board of Regents of the University of Nebraska | Single site robotic device and related systems and methods |
10307199, | Jun 22 2006 | Board of Regents of the University of Nebraska | Robotic surgical devices and related methods |
10335024, | Aug 15 2007 | Board of Regents of the University of Nebraska | Medical inflation, attachment and delivery devices and related methods |
10342561, | Sep 12 2014 | Virtual Incision Corporation | Quick-release end effectors and related systems and methods |
10376322, | Nov 11 2014 | Board of Regents of the University of Nebraska | Robotic device with compact joint design and related systems and methods |
10470828, | Mar 15 2013 | Board of Regents of the University of Nebraska | Local control robotic surgical devices and related methods |
10582973, | Aug 08 2012 | Virtual Incision Corporation | Robotic surgical devices, systems, and related methods |
10667883, | Mar 15 2013 | Virtual Incision Corporation | Robotic surgical devices, systems, and related methods |
10806538, | Aug 03 2015 | Virtual Incision Corporation | Robotic surgical devices, systems, and related methods |
10925685, | Mar 25 2015 | SONY OLYMPUS MEDICAL SOLUTIONS INC | Medical observation device, surgical observation device, and medical observation system |
10966700, | Jul 17 2013 | Virtual Incision Corporation | Robotic surgical devices, systems and related methods |
11007636, | Mar 31 2017 | KINOVA INC | Articulated mechanism with protective sleeve at joint |
11389952, | Jul 27 2018 | Seiko Epson Corporation | Robot arm |
11786334, | Dec 14 2016 | Virtual Incision Corporation | Releasable attachment device for coupling to medical devices and related systems and methods |
11806097, | Mar 14 2013 | Board of Regents of the University of Nebraska | Methods, systems, and devices relating to robotic surgical devices, end effectors, and controllers |
11819299, | May 01 2012 | Board of Regents of the University of Nebraska | Single site robotic device and related systems and methods |
11826014, | May 18 2016 | Virtual Incision Corporation | Robotic surgical devices, systems and related methods |
11826032, | Jul 17 2013 | Virtual Incision Corporation | Robotic surgical devices, systems and related methods |
11832871, | Jun 10 2011 | Board of Regents of the University of Nebraska | Methods, systems, and devices relating to surgical end effectors |
11832902, | Aug 08 2012 | Virtual Incision Corporation | Robotic surgical devices, systems, and related methods |
11872090, | Aug 03 2015 | Virtual Incision Corporation | Robotic surgical devices, systems, and related methods |
11883065, | Jan 10 2012 | Board of Regents of the University of Nebraska | Methods, systems, and devices for surgical access and insertion |
11903658, | Jan 07 2019 | Virtual Incision Corporation | Robotically assisted surgical system and related devices and methods |
11909576, | Jul 11 2011 | Board of Regents of the University of Nebraska | Robotic surgical devices, systems, and related methods |
5410944, | Jun 03 1993 | Telescoping robot arm with spherical joints | |
5894754, | Apr 26 1996 | Amada Company, Limited; Crea S.r.l. | System for producing bent sheet-metal articles and components of the system |
5976122, | May 20 1996 | Intuitive Surgical Operations, Inc | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
6371952, | May 20 1996 | Intuitive Surgical Operations, Inc | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
6685698, | Jul 27 2000 | Intuitive Surgical Operations, Inc | Roll-pitch-roll surgical tool |
6701220, | Jun 24 1999 | ABB AB | Industrial robot device |
6746443, | Jul 27 2000 | Intuitive Surgical Operations, Inc | Roll-pitch-roll surgical tool |
6902560, | Jul 27 2000 | Intuitive Surgical Operations, Inc | Roll-pitch-roll surgical tool |
6991627, | May 20 1996 | Intuitive Surgical Operations, Inc | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
7248944, | Jan 21 1992 | Institute Surgical, Inc | Roll-pitch-roll wrist methods for minimally invasive robotic surgery |
7316681, | May 20 1996 | Intuitive Surgical Operations, Inc | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
7398707, | Jul 27 2000 | Intuitive Surgical Operations, Inc | Roll-pitch-roll surgical tool |
7492116, | Jul 08 2003 | Virtual Incision Corporation | Robot for surgical applications |
7772796, | Jul 08 2003 | Board of Regents of the University of Nebraska | Robotic devices with agent delivery components and related methods |
7780651, | May 20 1996 | Intuitive Surgical Operations, Inc | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
7890211, | Jan 21 1992 | Intuitive Surgical Operations, Inc. | Master-slave manipulator system and apparatus |
7914522, | Jul 27 2000 | Intuitive Surgical Operations, Inc | Roll-pitch-roll surgical tool |
7960935, | Jul 08 2003 | The Board of Regents of the University of Nebraska | Robotic devices with agent delivery components and related methods |
8297672, | Jul 16 2008 | Samsung Electronics Co., Ltd. | Humanoid robot |
8343141, | May 20 1996 | Intuitive Surgical Operations, Inc. | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
8343171, | Jul 12 2007 | Board of Regents of the University of Nebraska | Methods and systems of actuation in robotic devices |
8528440, | Jul 27 2000 | Intuitive Surgical Operations, Inc. | Method for minimally invasive surgery |
8604742, | Jul 08 2003 | Board of Regents of the University of Nebraska | Robotic devices with arms and related methods |
8679096, | Jun 21 2007 | Board of Regents of the University of Nebraska | Multifunctional operational component for robotic devices |
8709000, | May 20 1996 | Intuitive Surgical Operations, Inc. | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
8828024, | Jul 12 2007 | Board of Regents of the University of Nebraska | Methods, systems, and devices for surgical access and procedures |
8834488, | Jun 22 2006 | Virtual Incision Corporation | Magnetically coupleable robotic surgical devices and related methods |
8894633, | Dec 17 2009 | BOARD OF REGENTS OF THE UNIVERSITY OF NEBRASKA AT LINCOLN | Modular and cooperative medical devices and related systems and methods |
8950286, | Oct 02 2009 | Commissariat a l Energie Atomique et aux Energies Alternatives | Robot or haptic interface structure with parallel arms |
8968267, | Aug 06 2010 | Board of Regents of the University of Nebraska | Methods and systems for handling or delivering materials for natural orifice surgery |
8968332, | Jun 22 2006 | Virtual Incision Corporation | Magnetically coupleable robotic surgical devices and related methods |
8974440, | Aug 15 2007 | Board of Regents of the University of Nebraska | Modular and cooperative medical devices and related systems and methods |
9010214, | Jun 22 2012 | Board of Regents of the University of Nebraska | Local control robotic surgical devices and related methods |
9033998, | May 13 2010 | MARLEX ENGINEERING INC ; TITAN MEDICAL INC | Independent roll wrist mechanism |
9060781, | Jun 10 2011 | Board of Regents of the University of Nebraska | Methods, systems, and devices relating to surgical end effectors |
9089353, | Jul 11 2011 | Board of Regents of the University of Nebraska | Robotic surgical devices, systems, and related methods |
9128507, | Dec 30 2013 | Harris Corporation | Compact haptic interface |
9173643, | Jul 27 2000 | Intuitive Surgical Operations Inc. | Pitch-roll-yaw surgical tool |
9179981, | Jun 21 2007 | Board of Regents of the University of Nebraska | Multifunctional operational component for robotic devices |
9205555, | Mar 22 2011 | Harris Corporation | Manipulator joint-limit handling algorithm |
9403281, | Jul 08 2003 | Board of Regents of the University of Nebraska | Robotic devices with arms and related methods |
9498292, | May 01 2012 | Board of Regents of the University of Nebraska | Single site robotic device and related systems and methods |
9510915, | May 20 1996 | Intuitive Surgical Operations, Inc. | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
9579088, | Feb 20 2007 | Board of Regents of the University of Nebraska | Methods, systems, and devices for surgical visualization and device manipulation |
9638497, | Oct 06 2011 | Harris Corporation | Improvised explosive device defeat system |
9743987, | Mar 14 2013 | Board of Regents of the University of Nebraska | Methods, systems, and devices relating to robotic surgical devices, end effectors, and controllers |
9757187, | Jun 11 2012 | Board of Regents of the University of Nebraska | Methods, systems, and devices relating to surgical end effectors |
9770305, | Aug 08 2012 | Board of Regents of the University of Nebraska | Robotic surgical devices, systems, and related methods |
9883911, | Jun 22 2006 | Board of Regents of the University of Nebraska | Multifunctional operational component for robotic devices |
9888966, | Mar 14 2013 | Board of Regents of the University of Nebraska | Methods, systems, and devices relating to force control surgical systems |
9956043, | Jul 12 2007 | Board of Regents of the University of Nebraska | Methods, systems, and devices for surgical access and procedures |
9999473, | May 20 1996 | Intuitive Surgical Operations, Inc. | Articulated surgical instrument for performing minimally invasive surgery with enhanced dexterity and sensitivity |
Patent | Priority | Assignee | Title |
4507046, | Jul 21 1980 | Hitachi, Ltd. | Articulated industrial robot |
4645409, | Nov 19 1982 | AMERICAN ROBOT CORPORATION, A PA CORP | Outer arm assembly for industrial robot |
4671732, | Feb 05 1982 | AMERICAN ROBOT CORPORATION, A PA CORP | Industrial robot |
4688984, | Dec 14 1983 | Fanuc Ltd. | Wrist driving mechanism for industrial robot |
4771652, | Dec 19 1985 | KUKA Roboter GmbH | Manipulator-head drive assembly |
DE3717597, | |||
EP121843, | |||
EP122942, | |||
EP74882, | |||
GB2160845, |
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Sep 20 1991 | BETTINARDI, MARCO | Comau SpA | ASSIGNMENT OF ASSIGNORS INTEREST | 005868 | /0583 | |
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